"Allah's Messenger would say one Taslim for the Salat while facing forward and turning to his right side a little."
Jami` at-Tirmidhi Book 2, Hadith 148
← Previous Hadith "The Prophet would say the Salam from his right and from his left (saying): (As-Salamu alaikum wa rahmatullah, as-Salamu alaikum wa rahmatullah) 'Peace be upon you, and Allah's mercy. Peace be upon you, and Allah's mercy.'"

Jami` at-Tirmidhi Book 2, Hadith 147 Next Hadith → "Hadhf the Salam is a Sunnah."

Jami` at-Tirmidhi Book 2, Hadith 149